sources and sinks lab-hpr

8/18/2019 Sources and Sinks LAB-HPR

1/5

Sources and sinks withregenerative capability save cash

With regenerative sources and sinks by ET System electronic, energy costs can be lowered by up to 96 %.

Depending on the testing task, the annual cost savings quickly add up to five-figure amounts.

Electronic loads simulate any consumer in test

benches and test set-ups and allow for tests and

experiments with accumulators, network and

battery chargers or generators. The power used

in these applications with multiple devices that

are connected in parallel quickly soar into values

in the megawatt range - with the result that the

cost of electricity takes on impressive dimensions.An example calculation illustrates this very clearly:

A company that consumes on average per year

10 kW as continuous power for its test runs,

requires 87,600 kWh of electric energy for this

purpose. At a price of 25 cents per kWh, the cost

for electricity is almost 22.000 € per year.

Such costs are more than just remarkable – and

above all, they are also avoidable for the most

part, because regenerative sinks or regenerativesources/sinks are able to recover a large part of

the electrical energy, thus delivering a significant

saving of over 90 % of the electricity costs. They

convert the energy captured, for example, when

testing a battery, a generator or a photovoltaic

module, to a mains voltage and feed this energy

back into the network – and the savings are

here so significant that the additional costs of a

regenerative sink are quickly recouped.

Recovery slashes costs

ET System electronic is one of the world's leading

providers for AC and DC power sources, power

supplies, electronic loads, regenerative loads and

regenerative sources/sinks.

The company offers its customers a wide range

of electronic loads that cover a wide range of

applications and are always available asregenerative variants as well. Regenerative

sources/sinks, however, are a combination of a

DC power source with a regenerative electronic

load and thus combine two devices in one housing.

When using these devices, the actual power

consumption is confined to power dissipation in

the source and the sink. In case of testing tasks

not associated with storing energy in batteries

and other accumulators, it is possible to carry outtest runs with test powers of 30 kW, for example,

while the actual power requirement is limited to

about 3 kW with an overall efficiency of 90 %.

This has positive consequences not only for the

cost of electricity but also for the network's peak

load: It increases only slightly despite large

electrical test powers so that the company can

continue to remain in favourable tariff ranges

although using high peak outputs during testing.

However, energy recovery is also of interest in

cases where experiments require a lot of power

but the available fuses are only for 64 A or in

locations with a weak local network making it

impossible to draw a lot of power at any given

time, for example in test areas with inferior fuse

protection but also in remote locations, in regions

with insufficient power supplies or on sites

generating their own energy, for example with

generators or photovoltaic panels.

Hauptstraße 119 -121 phone +49-6205-3948-0 e-mail [email protected]

D-68804 Altlußheim fax +49-6205-37560 web www.et-system.de


2/5


A chronological gap exists between the energyconsumption and the energy recovery, however,

when testing energy-absorbing devices. The

energy for the test run therefore must first come

from the power supply network, for example,

when charging a battery for test purposes.

However, as soon as the energy storage device is

being drained, the thereby released energy can

be fed back into the network again. This usually

does not even require a two-way meter, because

the recovered and returned power is usually

lower than the total requirements of the company.

This means the process here consists of a virtual

internal equalisation while the respective lesser

amount of energy is drawn from the power

supply network during the recovery.

Highest degree of efficiency through smartelectronics design

Both the regenerative loads of ET System electronic

as well as the regenerative sources/ sinks operate

based on the same functional principle. The

devices are equipped with a boost converter,

which increases the supplied input voltage to a

DC voltage of about 650 V.This means the boost

converter is a switched-mode power supply

designed to produce a constant operating voltage

from fluctuating input voltages. The next step

uses this DC voltage to supply an inverter that

generates a sinusoidal voltage and feeds this

back into the network.

Block diagram of a regenerative source




3/5


At what voltages and currents the devices returna mains voltage depends on the overall size and –

above all – on the quality of the electronics

design. The regenerative sinks or sources/sinks

by ET System electronic produce a stable mains

voltage even with very low supply voltages and

thus recover energy even in voltage ranges in

which competing products are still ineffective.

The overall efficiency and the profitability of the

regenerative sinks by ET System electronic is

therefore unusually high; in the optimum working

range, an efficiency factor of about 96 % is not

uncommon.

Two model series for every requirement

ET System electronic offers their customers two

different series of regenerative sources/sinks that

can be adapted to customer-specific requirements

at any time if and as necessary:

The LAB/HPR series devices are equipped with a

highly dynamic 2-quadrant rectifier system.

A very fast control dynamics is achieved througha modern PWM rectifier control based on

IGBT across the entire power range, and the

configurable interfaces enable easy integration

into a wide range of system and test environments.

Typical applications include automotive energy

systems in the field of hybrid vehicles, battery

simulation and testing, inverter and DC engine

testing. The devices are naturally air-cooled,

provide output voltages up to 1.200 V and output

currents up to 1.000 A with outputs from 5 kW to

90 kW, but can also be connected in parallel up

to a total capacity of 2 MW upon request. They

deliver a continuous transition from the power

supply to the current regeneration and a fast

dynamic as a source (


4/5


Regenerative LAB/HPR 30100with an output power of 30 kW

The devices are equipped with intelligentmonitoring and field-proven control functions,

feature an electrically isolated output and digital

interfaces such as relays, RS-232, RS-485, IEEE 488,

LAN, USB and an SD card slot. The front panel has

a graphical display with intuitive menu navigation

used for operation. Remote control via PC or CAN

terminal is possible as well depending on model

and design.

With integrated features such as UI mode, script

mode, UIP mode (optional) or UIR mode (optional),

very productive work is possible, and the script

control via SD card or digital interface also allows

for the programming of any processes and output

characteristics. The current operating values can

be written to the memory card in an adjustable

interval so that establishing an independent

"stand-alone" test station is possible in conjunction

with the script control without further investment.

Type LAB/SL sources/sinksThe type LAB/SL sources and sinks are equipped

with a highly dynamic 2-quadrant rectifier system

designed specifically for comprehensive power

testing in the vehicle operation of electric motors,

such as in the use of hybrid motors. The PWM

rectifier control based on an IGBT ensures a fast

control dynamic across the entire power range

and the configurable interfaces enable easy

integration into a wide range of system and test

environments. The devices of the LAB/SL series

are naturally air-cooled, provide output voltages

up to 1.000 V and output currents up to 800 A

with outputs up to 500 kW but can be connected

in parallel as well up to a total capacity of 2 MW.

They offer a continuous transition from the power

supply to the power supply regeneration and a

high control dynamics of less than 3 msec with a

low residual ripple of less than 0.5 %, and the

integrated PFC ensures low system perturbations.

The devices are equipped with intelligent

monitoring and field-proven control functions,

feature an electrically isolated output and

interfaces such as RS232, relays, CAN terminal

and Ethernet.




5/5


Electronic loads also capable of energy recoveryIn addition to regenerative sources/sinks,

ET System electronic also offers a wide range of

electronic loads, which are always available as

regenerative variants as well. For example, the

loads of the ELP/DCM series include 16 sizes and

cover a range from 150 W up to 200 kW. They can

accommodate currents up to 1.500 A at voltages

up to 1.200 V and provide all operating modes

required in practice:

In constant current mode, they accommodate

currents up to 500 A maintained with an accuracy

of 0.05 % and 0.1 %, respectively.

In constant resistance mode, resistance ranges

between 0.03 Ω /0.3 Ω and 5 kΩ /10 kΩ can be set

with an accuracy of 16 bit. Constant voltages up

to 1.200 V can be set depending on size, with an

accuracy of 0.03 %+0.02/0.05 % FS. And last but

not least, in constant power mode it is possible to

realise power up to the full 200 kW with an

accuracy of 0.1/0.2 %+0.1/0.15 FS.

Battery tests with input voltages between 0.5and 120 V are possible as well. The maximum

measuring capacity here reaches up to 999 Ah at

a resolution of 0.1 A, the measurement period

can be between 1 second and 32 hours. The

devices accommodate currents between 3.3 and

1650 A with internal resistances between 7 and

55 mΩwhile the short-circuit function is enabled.

The desired current waveforms can be

programmed comfortably with the front panel.

The soft start can be programmed for a delay

between 1 ms and 200 s, depending on the

respective temperature and voltage settings.

In dynamic tests, the rise/fall times can be set and

the maximum current rise times of 2.5 A/uS allow

dynamic load applications, which are required in

many applications.



sources and sinks lab-hpr

Documents